class Universe { answer() { return 42; } } // ---------------------------------------------------------------------------- var universe = new Universe(); assert.equal(42, universe.answer()); var keys = []; for (var key in universe) { keys.push(key); } assert.isTrue(keys.indexOf('answer') !== -1); assert.isTrue(keys.indexOf('constructor') === -1); for (var key in Universe) { fail('Universe contains static member : ' + key); }